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validateUtf8: catch overlong ascii

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Make unicode.validateUtf8() check for overlong ascii representations, which are 2 bytes long and start with c0 or c1.
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theduke 2015-11-26 16:05:24 +01:00
commit 25b605a3a2
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lib/pure/unicode.nim
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@ -114,6 +114,7 @@ proc validateUtf8*(s: string): int =
if ord(s[i]) <=% 127:
inc(i)
elif ord(s[i]) shr 5 == 0b110:
if ord(s[i]) < 0xc2: return i # Catch overlong ascii representations.
if i+1 < L and ord(s[i+1]) shr 6 == 0b10: inc(i, 2)
else: return i
elif ord(s[i]) shr 4 == 0b1110: